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tail of empty list
java.lang.UnsupportedOperationException: tail of empty list	at scala.collection.immutable.Nil$.tail(List.scala:339)	at scala.collection.immutable.Nil$.tail(List.scala:334)	at scala.reflect.internal.SymbolTable.popPhase(SymbolTable.scala:172)	at scala.reflect.internal.Symbols$Symbol.unsafeTypeParams(Symbols.scala:1477)	at scala.reflect.internal.Symbols$TypeSymbol.tpe(Symbols.scala:2777)	at scala.reflect.internal.Mirrors$RootsBase.init(Mirrors.scala:235)	at scala.reflect.runtime.JavaMirrors$class.createMirror(JavaMirrors.scala:34)	at scala.reflect.runtime.JavaMirrors$class.runtimeMirror(JavaMirrors.scala:61)	at scala.reflect.runtime.JavaUniverse.runtimeMirror(JavaUniverse.scala:12)	at scala.reflect.runtime.JavaUniverse.runtimeMirror(JavaUniverse.scala:12)	at org.apache.spark.sql.catalyst.ScalaReflection$.mirror(ScalaReflection.scala:36)	at org.apache.spark.sql.catalyst.ScalaReflectionSuite$$anonfun$12$$anonfun$apply$mcV$sp$1$$anonfun$apply$1$$anonfun$apply$2.apply(ScalaReflectionSuite.scala:256)	at org.apache.spark.sql.catalyst.ScalaReflectionSuite$$anonfun$12$$anonfun$apply$mcV$sp$1$$anonfun$apply$1$$anonfun$apply$2.apply(ScalaReflectionSuite.scala:252)	at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)	at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)	at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)